Steam-injector.



. R. 0. BROOKE. STEAM INJECTOR. APPLIOATION FILED APB. 18,1910;

Patented Dec. 6, 1910.

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APPLICATION FILED APR. 18,1910.

PatentedDec. 6, 1910.

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ROBERT GRUNDY BROOKE, OF MACCLESFIELID, ENGLAND.

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Specification of Letters Patent.

Patented Dec. 6, 1910.

Application filed April 18, 1910. Serial No. 556,122.

To all whom it may concern:

Be it known that I, ROBERT GRUNnY BROOKE, a subject of the King of GreatBrltain and Ireland, residing at Macclesfield, in the county of Chester,England, have invented Improvements Relating to Steam- Injectors, ofwhich the following is a specification.

This invention relates to steam injectors and it has for its Object theprovision of arrangements whereby the pressure of fluid in the deliveryor discharge chamber or cone, utilized to hold the overflow valve closedafter the water jet has been formed, is sub ject to the control of fluidintercepting or pressure reducing means such that premature closure ofthe overflow valve, due to pressure values in the delivery chamber orcone (hereinafter called the delivery cone) at starting, is prevented.

The invention further consists in providing certain novel combinationsand arrange ments of parts all as hereinafter-more particularlydescribed and claimed.

In the accompanying drawings, Figure 1 is a central longitudinal sectionof part of an injector illustrating the control of the overflow valve.Fig. 2 is a fragmentary view corresponding to Fig. 1, showingamodification. Fig. 3 1s a view similar to Flg. 1 illustrating a furthermodification. Fig. 4: is a central section showing the invention appliedto an injector having re-starting means controlling the area of thesteam nozzle, as described in the specification of my co-pendingapplication Serial No. 556,123.

As shown in Fig. 1, the overflow valve 04 is formed with a hollowtubular stem 6 working through a substantially fluid tight guide 0screwed into the body cl of the injector, the said guide being providedwith a cap 0 serving, in conjunction with the guide 0, to form a fluidreceiving chamber f and, alone, as the seat 9 for a loaded valve h(hereinafter called a controlling valve) having a stem 11 that workswithin the tubular stem b of the overflow valve. Conveniently, thecontrolling valve 72, may, as shown, be loaded by means of a compressedspiral spring surrounding its stem and bearing against the guide 0. Thedelivery or discharge chamber 70 of the injector, as in a known way, isformed with a lateral port or passage m, which is connected by means ofa tube a, or equivalently, to a port or passage 9 passing through theseat 9 of the conbeen properly started and the controlling valve itopened, the pressure of the fluid entering the chamber f, assuming thatsteam is being supplied at a pressure high enough to cause such anopening of the controlling valve h, will act upon'the said spindle b andclose the Overflow valve a if it has not already closed, or maintain itclosed it closed, the controlling valve 72. remaining open so long asthe injector is at work.

In some cases in lieu of the arrangement just referred to, thecontrolling valve might, as shown in Fig. 2, be omitted and the Overflowvalve a be formed with one or more leakage passages a that lead to theoverflow duct 0 and which is or are opened at some prearranged pointduring the openil'lg of the overflow valve, and remains or remain so, toprevent accumulation of pressure suflicient to close the overflow valveuntil the injector is at work, when the increased and continued.

pressure in the delivery chamber will, as before, act to close theoverflow valve, if not already closed, and in either case maintain itclosed. WVhen the valve is closed, the leakage passage or passages a tothe overflow 0 will, as shown, also be closed.

In order to prevent the possibility of the pressure to which the fluidin the fluid receiving chamber 7 may have been raised, while theinjector was at work, being main tained to oppose free opening of theoverflow valve a on re-starting, the spindle b whereon the pressure actsto hold the valve closed, may, as shown in Fig. 1, be formed withleakage grooves 79 and the guide 0 with w a groove 6 which communicatesthrough a passage 79 with a free outlet, say the water inlet chamber 6of the injector; or the leakage fluid may be led to the over flow duct0, as by allowing it to leak through the passages a In some cases thefluid may be conducted to the chamber 7 directly from the delivery coneof the injector, Figs. 3 and 4 showing such modification applied toinjectors having no delivery chamber. Thus, in Fig. 3 the passage mleading to the chamber f extends directly from the delivery cone m. Thecontrolling valve 70 may, as shown, be arranged in a separateintermediate chamber 7L A similar separate intermediate chamber may alsobe adopted in the case of injectors having delivery chambers as inFig. 1. In Fig. 4 the overflow valve (0 and control valve h are arrangedin substantially the same way as in Fig. l and the passage m leading tothe chamber f is formed partly in the delivery tube 171 and partly inthe portions (0, (Z of the body (Z, and in the cap 6.

respectively. The various parts of the passage m in each case (Figs. 3and 4), severally communicate with annular grooves (Z in the contactingfaces of the several elements referred to whichaare subjectto motion ofrotation in fitting the injector, so that continuity of the passage m isat all times maintained.

WVhat I claim is 1. In a steam injector, the combination with anoverflow valve, means for closing said valve, a fluid pressure chamberin communication with the valve closing means, and a connection forconducting fluid from the delivery of the injector to the pressurechamber, of a valve arranged to intercept fluid tending to pass from thedelivery to the pressure chamber with momentary in crease of pressure inthe delivery, prior to formation of the jet, to values equal to themaximum derivable after the formation of the jet.

2. In a steam injector, the combination with an overflow valve, and achamber arranged to receive fluid under pressure from the delivery ofthe injector, of a plunger extending into said chamber, said plungerbeing connected to the overflow valve and provided with a passage toallow of leakage of 'fltiid'from said chamber.

8. In a steam injector, the combination with an overflow valve, a fluidpressure A chamber, and a connection for conducting fluid from thedelivery of the injector to the pressure chamber, of a loaded valvearranged to intercept temporary passage of fluid to such chamber, andvalve operating means influenced by the fluid pressure in the chamberand having leakage passages for the purpose specified.

t. In a steam injector, the combination with an overflow valve, of afluid pressure chamber, a connection arranged to conduct fluid from thedelivery of the injector to the pressure chamber, a loaded valvearranged to intercept passage offluid to such chamber, and overflowvalve operating means arranged to be influenced by the fluid in thechamber and having leakage passages for the purpose set fort 5. A steaminjector, comprising, in combination with a casing having an overflowchamber and an overflow valve therein, of a fluid pressure chamber insaid casing, a connection for conducting fluid from the deliver 1 of theinjector to the pressure chamber, a hollow plunger connected to thevalve and extending into the said pressure chamber, and a loaded valvearranged in the pressure chamber to intercept passage of liquid to thelatter and having a stem Working in the hollow plunger of the overflowvalve, said plunger having leakage grooves therein and said casinghaving a co-acting leakage passage for the purpose set forth.

Signed at London England this sixth day of April 1910.

ROBERT GRUNDY BROOKE.

Witnesses H. D. JAMES/0N, R. F. lVILLIAMs.

